Metal floor grating



Aug. 29, 1933. RQTHMAN 1,924,570

- METAL FLOOR GRATING' OriginalFiled Oct. 9, 1929 INVENTOR 41/9527" f 776M744 AT RNEY QMM Patented Aug. 29, 1933 METAL FLOOR GRATING Albert Rothman, New York, N. Y.

Application ,3 Claims.

The object of my invention is to provide a floor grating of this class which will have a minimum amount of material and a maximum strength and suflicient roughness to prevent slipping. This object is accomplished by my invention, one embodiment of which is'hereinafter more particularly set forth.

For a more detailed description of my invention, reference is to be had to the accompanying drawing, forming a part hereof in which Figure 1 is a plan view of a portion of a'grating embodying my invention.

Figures 2 and 3 are sectional views, taken on the lines 22 and 3-3 respectively, of Figure 1.

Figure 4 is a diagrammatic view illustrating a feature of my invention.

Throughout the various views of the drawing, similar reference characters designate similar parts.

My improved grating 1 has a number of straight members 2 and diagonal members 3, the diagonal members connecting two adjacent straight members, which are parallel, and running diagonally with a line contact from one straight member to the other. The points of contact are secured together by welds 4 at the top and bottom which are made large and rough so as to prevent the slipping of a person using the grating.

The advantage of this construction will be readily understood from Figure 4 wherein is shown in full lines a grating embodying my invention with the welds omitted, and in dotted lines diagonal members which are supposed to be secured in the conventional way by rivets, not shown. The straight membersare designated 2, as before, and the diagonal members in full lines are designated 3. The diagonal members in dot-,

longitudinal members 2 and 5 tend to buckle and October 9, 1929, Serial No. 398,278 Renewed January 17, 1933 separate and snap off the rivet heads. They can do this because the part of the member extending from rivet to rivet does not run in a straight line. With the structure shown in Figures 1, 2 and 3 and in the full lines in Figure 4 for a given weight of material, much greater resistance is offered, because the welds 4 are put as far from the neutral axis as possible and there is only a line contact between the members 3 and 2 so that these members are of a minimum length between contacts and so cannot buckle but can simply elongate, whereby their whole tensile strength is employed against deformation. From the nature of such shapes this result must follow in the environment specified. For this reason,

ure 4.

While I have shown and described one embodiment of my invention, it is obvious that it is not restricted thereto, but that it is broad enough to cover all'structures that come within the scope of the annexed claims.

Having thus described my invention, what I claim is:

1. A floor grating composed of a number of parallel strips and diagonal strips connecting the same, the diagonal strips having a line contact with the parallel strips and secured thereto by welding.

2. A floor grating composed of a number of parallel strips and diagonal strips connecting the same, the diagonal strips having a line contact with the parallel strips and secured thereto by rough welding at the top.

3. A floor grating composed of a number of parallel strips and diagonal strips connecting the same, the diagonal strips having a line contact with the parallel strips and secured thereto' by top and bottom welds at the line of contact.

ALBERT ROTHltJAN.

ends of each 

